Build a mission.
Beat the physics.
You have one rocket, one budget, and a world that is always moving. Design the spacecraft, choose the launch vehicle, balance power and mass, then fly the trajectory yourself.
Mission Control
Choose a world, then pick a mission. Gravity, atmosphere, and comms range change with every destination.
From blank bay to orbit in six moves
Choose a planet, then a mission. Orbit, instruments, comms, and budget define your constraints.
Drag any part into the 3D bay. Hitboxes stop parts from overlapping.
Mass, thrust, power, comms, science, and cost all push against each other.
Drag an attached part to the scrap bin for a 20% refund.
Use the guidance computer or take manual control through the atmosphere.
See how gravity, rotation, atmosphere, and every trade-off shaped the result.
Three forces you cannot ignore
Pulls harder the lower you fly. It steals delta-v on ascent and accelerates your return.
Drag steals speed near the ground, then heats and slows your capsule on reentry.
Gives an eastward launch assist — and moves the landing zone under your spacecraft.
SKY SENTINEL
400 km climate orbit · camera + spectrometer · ≥250 comms
SKY SENTINEL
Ground track & altitude
Autopilot will fly a gravity turn and circularize at the target orbit. Take control any time.
LAUNCH SEQUENCE
Ignition in 3 seconds. All systems nominal.
Bring the capsule home
Drag is building. Deploy the parachute below 15 km for a soft touchdown.
MISSION SUCCESS
Sky Sentinel delivered a climate observatory to low Earth orbit.